update data php code

update.php
<?php
include('ketnoi.php');
$ht=$_POST['hoten'];
$tp=$_POST['tp'];
$id=$_GET['id'];
$gt=$_POST['gioitinh'];
$qup="update member set hoten='$ht',thanhpho='$tp',gioitinh='$gt' where id='$id'";
mysql_query($qup);
echo("up ok".$tp.$ht.$id);
?>